x2 for the H-pipe. X and Y configurations will both scream more than a H also. In terms of power, you’ll make more with a Y-pipe. They’re also cheaper, look at ISR, SOHO or Greddy. The argument for X is better aesthetic and subjectively better sound.
A lot of people will recommend Fast Intentions. They’ll argue great quality, customer service and sound, but you’ll pay $1,200 minimum and wait several months. The Invidia systems are both great X-pipe alternatives for a fraction of the price and they are also great quality.
There are also systems like the Greddy EVO GT or Motordyne which utilize kind of a hybrid X/Y.
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